How to find a suitable 2 sided mattress?

I have just mailed your office with a question as I thought I'd made up my mind on which bed I wanted...but now after reading a few more threads and answers I think I've got myself completely confused. We currently have a silentnight micro pocket 2100 kingsize mattress on a wooden slatted frame. It's awful, nothing else to describe it. After less than 5 years both edges have now collapsed (I sleep on the edge and rotating it has only managed to destroy both sides). I went back to bensons, who couldn't find my original purchase (convenient) but I also got told that they would take wear and tear into account so probably wouldn't get anything from company as it only ad a 5year guarantee. It's a no turn mattress so feel that I've had less time than I should have got from a £800+ (i think) mattress. Your site is excellent with so much info it has taken me quite a while to trawl through all the questions I had. I am now going to invest in at least one mattress topper and have been looking for a two sided mattress, I didn't really want to spend over £1000 so we decided on the Origins Pocket 1500 as the latex variety is one sided (not happy at choosing that option again and your site kinda confirms that choice - why do you make a one sided version?) and at £545 we felt it was a very good price too..........but I have now been looking at the artisan range and may be swayed. I initially looked at the origins because we felt it was affordable to change it if it only lasted 5 years, and if we could extend that time by using mattress toppers even better. Could I afford a higher end mattress...yes, but by compromising on buying other things.!

Is it going to be cost and time effective to take the better quality artisan mattress?

Initially I originally only wanted to spend in the region of £800-1000, so would like your advice if possible. Kind regards Karen >